Preheat oven to 400 F. Line a baking sheet with aluminum foil. Spray with cooking spray.

Using a large, heavy knife, cut off ends of the squash. Peel using a vegetable peeler. Cut squash in half, remove seeds and cut squash into 3/4-inch cubes. Place squash cubes in a zip-close bag. Drizzle with 2 tablespoons of the oil and season with salt and pepper. Seal and toss to coat evenly. Spread in a single layer on prepared baking sheet. Bake uncovered in preheated oven for 20 to 25 minutes or until tender and edges are lightly browned, stirring midway through cooking.

Meanwhile, cook the pasta in boiling water, according to package directions; drain.

Heat remaining 1 tablespoon oil in a medium skillet over medium high heat. Add the onion and cook, stirring frequently, for 3 to 4 minutes or until onion is just tender. Add the garlic and cook, stirring frequently for 30 seconds. Add 1 1/4 cups of the stock and the Italian seasoning. Heat until boiling. Reduce heat to maintain a simmer and cook, uncovered, for 5 minutes.